chore: #814 계정 설정 완료 버튼 disabled 상태 추가, 계정탈퇴 ui 변경

[supersett]

🏄🏼‍♂️‍ Summary (요약)

• 이름 혹은 프로필 사진 변경이 없다면 disabled 적용
• 계정탈퇴 ui 변경 (하단 취소버튼 제거, 상단왼쪽 뒤로가기 아이콘 추가)

🫨 Describe your Change (변경사항)

[변경 후]

🧐 Issue number and link (참고)

#814

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/issue-814

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[prgmr99]

LGTM 👍👍